linux-kernel - Re: [PATCH] md: fix rcu protection in md_wakeup

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Message-ID: <e60b45da-e37d-5530-1511-f6e56effebb2@huaweicloud.com>
Date: Wed, 15 Oct 2025 15:57:50 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: "Zhou, Yun" <yun.zhou@...driver.com>, Yu Kuai <yukuai1@...weicloud.com>,
 Paul Menzel <pmenzel@...gen.mpg.de>
Cc: agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com, song@...nel.org,
 dm-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] md: fix rcu protection in md_wakeup_thread

Hi,

在 2025/10/15 15:31, Zhou, Yun 写道:
> This method only changes a little code. But it holds the lock before the 
> function jumps, which seems to violate the principle of minimizing the 
> critical area.

use rcu to protect the function is fine, all related code is not from
IO fast path.

Please also notice this patch is impossible for stable backport because
of too much modifications.

Thanks,
Kuai